Condensed Consolidated Balance Sheets (Parentheticals) - USD ($)	Dec. 31, 2020	Jun. 30, 2020
Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 61,099	$ 74,082
Common stock, par value (in dollars per share)	$ 0.005	$ 0.005
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares issued (in shares)	7,447,489	7,404,831
Common stock, shares outstanding (in shares)	7,447,489	7,404,831